Current-induced vortex displacement and annihilation in a single Permalloy disk

TL;DR

This paper investigates how direct current influences magnetic vortex movement and annihilation in a Permalloy disk, revealing spin torque effects and vortex dynamics through planar Hall effect measurements.

Contribution

It demonstrates the current-induced vortex displacement and annihilation in a single Permalloy disk, confirming theoretical predictions with experimental data.

Findings

Current injection induces vortex displacement and annihilation.

Planar Hall effect measurements match theoretical models.

Spin wave excitations observed in differential resistance curves.

Abstract

The induced motion of a magnetic vortex in a micron-sized ferromagnetic disk due to the DC current injection is studied by measuring planar Hall effect. The DC current injection is found to induce the spin torque that sweeps the vortex out of the disk at the critical current while bias magnetic field are applied. The current-induced vortex core displacement deduced from the change in planar Hall resistance is quantitatively consistent with theoretical prediction. Peak structures similar to those originated from spin wave excitations are observed in the differential planar Hall resistance curve.